New Monodentate P,C-Stereogenic Bicyclic Phosphanes: 1-Phenyl-1,3a,4,5,6,6a-hexahydrocyclopenta[b]phosphole and 1-Phenyloctahydrocyclopenta[b]phosphole
作者:Zbigniew Pakulski、Oleg M. Demchuk、Jadwiga Frelek、Roman Luboradzki、K. Michał Pietrusiewicz
DOI:10.1002/ejoc.200400186
日期:2004.9
diastereomerically pure salts to the corresponding enantiomerically pure phosphane oxides. Stereoretentive reduction of P=O in (RP)-6 gave enantiomerically pure (SP)-4. Hydrogenation of (SP)-6 and subsequent reduction of P=O afforded saturated 1-phenyloctahydrocyclopenta[b]phosphole [(RP)-5]. Monophosphanes (SP)-4 and (RP)-5 were tested as chiral ligands and catalysts in model asymmetric hydrogenation and
外消旋1-苯基-1,3a,4,5,6,6a-六氢环五[b]磷(4)分离成对映体纯的1-苯基-1,3a,4,5,6,6a-六氢环五[b]磷1-氧化物 [(RP)-6 和 (SP)-6] 通过氧化拆分程序,包括用溴乙酸薄荷酯处理 4,结晶所得非对映异构的溴化鏻 8,以及将非对映异构纯盐立体选择性水解为相应的对映异构纯氧化磷。(RP)-6 中 P=O 的立体保留还原得到对映体纯的 (SP)-4。(SP)-6 的氢化和随后 P=O 的还原得到饱和的 1-苯基八氢环五 [b] 磷 [(RP)-5]。单膦 (SP)-4 和 (RP)-5 作为手性配体和催化剂在模型不对称氢化和 C-C 键形成反应中进行了测试。观察到高达 95% 的对映选择性。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)